Out of curiosity what would you do if you accidentally swiped "like" on a profile on a dating app?
In an admittedly very judgemental way (and so as not to drip feed) the gentleman in question was unique looking and I suspect wouldn't be many peoples idea of attractive. He is not conventionally handsome and to be fair his profile information also wouldn't have had me swiping right, nothing weird just not my cup of tea so to speak. He has sent me a very polite, friendly and obviously personalised message.
A) explain nicely it was an accidental like and wish him well
B) exchange a few messages and then nicely explain you're looking for different things so as to let him down as gently as possible before wishing him well
I know there are other options such as to ignore, delete, block, send a nasty message but I would never do that.
YABU for option A
YANBU for option B