I don't have time to practice any more. At all. So when I am playing leagues and guys will want to match up I say, no thanks, I haven't been playing at all. Usually they think it's just a stall or a way to ask for weight, but it's true and I don't want to play them because I know I'm not in good form.
As for things said after a match. I've learned that if I win anything I say can be 'insulting' if the person I say it to . By the same token, if I lose, anything I say to the winner can be taken as offensive or as a lack of respect.
So now, no matter whether I win or lose I shake hands and say, "good game." or "I enjoyed playing you." Or, if it's someone who I know is volatile, I'll just shake their hand and smile. If they say "you got lucky." I just say "Thank you." (That usually confuses them enough for me to get away

)
Many players will say something along the lines of "I played crappy" or "You got lucky" or something. If they do, I just smile, maybe say "Thank you" and walk away.
I really can't see anything productive from having that conversation, especially in a tournament where you need to keep positive for your next match, win or lose. So I try to nip it in the bud.
I really don't like it when I put a guy out of a tournament and he comes and finds me when I'm trying to get ready for my next match and wants to re-hash the ins and outs of "When I missed that three ball in the third game, I knew that was it for me" or "That lucky safe you got in in game 5 was a two game swing..." Even if they're being friendly and sincere about it, I just really don't want to have that conversation.
~rc