Maniacs make me into a donk

[nawhead]

By maniac, I mean a player who will play any 2 cards up to about a 10x bb preflop raise, in any position, and will play most pairs to the river against PSB's.

These type of players completely throw me off my game. I know they're guaranteed to lose their stack, but I get it into my mind that I have to be the one to get a big chunk of their stack or else I'm playing bad. If I get into a pot with them, I'm pretty much guaranteed to slowplay big pairs or bluff into them. I feel ok bluffing into them because they're not a calling station, they bet and call with any two, even queen high, and my range is better than them, so I must be ahead, right? Is this the right mindset to have against a maniac?

I also get tunnel vision, my eyes glued to this maniac's actions and how other people are reacting to him. Then some rock raises my CB and I forget that I'm not even in a pot with the maniac but play like I am. It's like I feel the cosmos has shifted because this maniac is taking down 40bb pots with 2nd pair so my top pair must be GOLD.

Then once my TPTK gets cracked, I insta-tilt, destroying any profits I made up to that point. But that's another story.

I'm beginning to think that I need to just leave the table when I see a manic sit down since I'm almost guaranteed to tilt, whether I play in a pot with them or not. What do you do?