Many sources recommend that you open with E4 or D4. This seems to me very aggressive and, frankly, rather piggy to occupy the center squares like that. I mean, most likely you hardly know this person, if at all.

 Wouldn't it be more polite to play, say, A3 or H3?

I find it rude when my opponents don't resign after 1.d4. After all, I'm clearly better by +0.37.

On second thought, I've noticed that my opponents sometimes find it convenient to rest a Knight on my B4 or G4 squares.

Perhaps it would be more relevant, helpful and nice to play C3 or F3, so as not to make them uncomfortable?

On third thought, that wouldn't help at all. They may not trust me not to take their pieces.

This is very difficult.

If you don't want to impose I recommend you open with Nf3 so that on the second move you can appologize to them and play Ng1.

f3 followed by kf2 is good!

Funny thread, MrToad2U

Toady likes sarcasm

Woody Allen used to pose the question- "Is sex dirty?"

Answer- "It is if you're doing it right!"

"Is chess rude, cruel, and unkind?"

Same answer.