Yes, happened to me two times quite recently. One player just wanted let me know that my deck is "braindead" (as opposed to his hyper-intelligent deck I figure
) then removed me, but that other one went on for ages, rambling some textbook bullying stuff about how I
obviously don't have friends and spend my whole life before computer. It was kind of funny first, but then finally ended up removing him cause he just didn't stop and I had things to do.
Personally I just have a good laugh then move on. Also I'll keep continuing to accept friend requests as I've actually had some nice conversations out of these with some other people. And to be honest this sore loser type also kind of entertains me.
But yeah if that kind of stuff gets to you, you should probably be more careful accepting random friend requests, cause these people exist, as the byproduct of... well, the internet I guess.