I do I'm afraid. It's an involuntary emotion, isn't it? I experience it quite often. I wish I didn't, it's quiet a painful feeling and very difficult to shake. And it keeps you in destructive relationships for far too long.
I don't agree that feeling pity is condescending or patronising though, that's just wonky. NOT feeling pity is inhuman IMO.
Maybe deliberately expressing pity in a condescending way is patronising, but that's a different thing entirely.