Usually I try to deal with IC issues through IC as well; it's a fairly large leap to assume that the player agrees with/condones their character's behaviour, just because characters are so diverse and most of us are quite far from the person we're portraying.
That said, if you've had negative interactions with this person OOC (and analyze carefully if the attitude in text you got was perceived or genuine; sometimes we perceive a tone that isn't intended thanks to the beast that is human nature), if this person's IC and OOC behaviour makes you genuinely uncomfortable or unhappy as a roleplayer, then I'd just try not to engage them and put them on ignore. Hobbies should be fun, and if both parties don't enjoy interaction with each other, then what's the point, right?
Kind of like some subject matter is just not stuff people want to roleplay with, sometimes it's best just to avoid rather than stress yourself out.
That said, if you've had negative interactions with this person OOC (and analyze carefully if the attitude in text you got was perceived or genuine; sometimes we perceive a tone that isn't intended thanks to the beast that is human nature), if this person's IC and OOC behaviour makes you genuinely uncomfortable or unhappy as a roleplayer, then I'd just try not to engage them and put them on ignore. Hobbies should be fun, and if both parties don't enjoy interaction with each other, then what's the point, right?
Kind of like some subject matter is just not stuff people want to roleplay with, sometimes it's best just to avoid rather than stress yourself out.