I dont really like winning by flagging my opponents. It feels like a dirty way to win, especially when you are losing. I also feel like it inflates your rating as flagging does not really reflect your skill level. Is that just a normal part of playing chess, or should i avoid doing it?
Yes, it's perfectly fine to flag your opponents. Flagging is just a part of chess. It's your opponent's fault if they move too slow, and it's just like beating them by checkmate or resignation or something like that.
and when you won by clock a position clearly lost with 0.1" ? Is it the opponent "too slow" or you won just for luck? Cm'on! be honest, be fair... nobody will die if you resign in a position you deserve to loose
You do not deserve to lose a position you win on time in, and it doesn't really matter if you have 0.1 at the end. The clock is still a part of chess, and if you flag your opponent then it doesn't matter what the position is on the board.
This is a huge part of both blitz and bullet. Are you saying I should resign in that scenario in a speed chess game too? Nonsense. I won't resign because I was about to win.
It's still the same thing for rapid and classical time controls as well. Although it's not nearly as common that you get low on time, You still need to move fast enough to where you aren't going to lose on time.
I never consider it luck because I won on time, nor do I consider it luck for my opponent when I lose on time because, as I said in the thing I wrote that you quoted, flagging is a part of chess. Learn to use it correctly.
Go ahead! Your opponent used up the clock, punish em for it!