The "Thank you" kind of player is one of the things that really grinds my gears as well, so definitely agreeing on that. I have tried countering it by tossing in some witty phrase like the one mentioned above, but honestly the best thing you can do about it is go and practise serves. I know that a lot of people don't even realise that it might seem annoying and to a degree disrespectful, however there are others who are completely aware of what they're doing and in my opinion you're just playing into their psycho games by responding to it.
I went from hearing this on a weekly basis to not even remembering when the last time was someone threw that at me. Serve practise might be boring, but surely worth it
Funny though, people who cho their lungs out is something I couldn't care less about. Since I watch a ton of video footage of pro level games, it became a familiar sound and I hardly register it. It's like the clicking of the ball on bounce, you don't notice it til it's missing.
And my biggest issue in the amateur scene are people who fault you for your own serves, yet theirs are about as far from legal as you could possibly get. If my serve is troublesome for them, it's obviously because I am covering the ball, not throwing it high enough, throwing it towards myself and making contact above the table. When they have no issues with the serve at all, I obviously still do all these things, but who gives a shit at that point, right? I mean he can handle it. This is paraphrased from a guy after a league game.
I know not every single one of my serves is perfectly legal, and even though I could change that, the error rate goes up significantly. I just don't see the point in crippling myself on demand of someone who doesn't do it right either, infuriates me.