Thanks!
Why are 1800 players easier to play against compared to 1300?

The most likely explanation is that you just got lucky over a small sample size. It's much harder to keep a 50% win ratio over 100 games than it is over 4 games, against players better than you.

Some other things which might influence this though are:
1) People tend to play more aggressively against low rated players. It's a psychological thing. So perhaps, having a 1900 next to your name instead of a 1300 made your opponents play a more scared, passive style against you.
2) High rated players tend to play fewer dubious openings than low rated players. And perhaps you just struggle to play against crazy stuff like the Danish Gambit or King's Gambit.
3) Perhaps you put in more effort against the 1800s than you did against the 1300s. You were focused and gave those games your best effort. Whereas you probably underestimated the 1300s and they caught you off guard.

I can't wait once OTB chess is back for club players, then 900-1500 will be roadkill for me.
I know that feeling. Right now I'm 1600 uscf, and when OTB comes back I'm going to take my revenge on all the people that I could never beat back when I was in elementary school (around 900 uscf). hehehe.

How would you rate my play here? (last truly sober game last night/today)? (I'm black)
suspicious opening, but white didn't know what to do with his extra piece, so you opened up the center (good) and mated him (even better)

2) High rated players tend to play fewer dubious openings than low rated players. And perhaps you just struggle to play against crazy stuff like the Danish Gambit or King's Gambit.
I believe a big part of the rating climb is learning how to deal with huge attacks and sacrifices.
My style is very unique, called "chicken out and grind" and works really well.
I once played in a 24 hour blitz tournament on chess.com. IIRC I lost to one 1300 and one 1400.
Sometimes stuff like that happens. But if I played them 10 games I'd probably win 9. That's how it works.
So play 100 games on a new account and see where your rating ends up... also, of course, it's important to make them rated games. Often people who play unrated are trying to protect their rating because 1) they're overrated and/or 2) they're very drunk, very tired, ect.
All four of my games were rated and the other ones played were sometimes rated, other times not.
How would you rate my play here? (last truly sober game last night/today)? (I'm black)
This is irrelevant to the topic, but just don't blunder pieces and make sure you determine the intention of every move played.

2) High rated players tend to play fewer dubious openings than low rated players. And perhaps you just struggle to play against crazy stuff like the Danish Gambit or King's Gambit.
I believe a big part of the rating climb is learning how to deal with huge attacks and sacrifices.
My style is very unique, called "chicken out and grind" and works really well.
Yeah, I kind of try that but it rarely works

2) High rated players tend to play fewer dubious openings than low rated players. And perhaps you just struggle to play against crazy stuff like the Danish Gambit or King's Gambit.
I believe a big part of the rating climb is learning how to deal with huge attacks and sacrifices.
My style is very unique, called "chicken out and grind" and works really well.
Yeah, I kind of try that but it rarely works
Sometimes you gotta cool it and grind all day, makes them annoyed
Chess.com has my rating incorrect. My USCF is 961 but I rock with a 1803 Blitz. You can clearly tell that i have played over 700 blitz games.
How is that even possible?
Check out his progress bar over the last year.
It seems that he was busy improving.
@GrandMasterNoob21
Well done, it's a really great achievement for such a short time period.