55s, flopped two pair from BB level 1 against tight multitabler

[marand]

$55 speed on Party.

First hand so everyone has 2000 chips.
3 players limp in. SB folds. I check in the BB with 84o.

Flop is Q84 rainbow. Pot is 180.
"Hero" bets 180, 2 folds, TightMultitabler raises to 400, "Hero" goes hmmmmmm and does what?

What can he have that beats me?
88 and 44 is obvious, but only 1 combination each left.
He would have raised QQ preflop so that's not in his hand range.

What can he have that I beat?
KK or AA is not possible since he would have raised preflop.
AQs or KQs? (I don't think he plays AQo or KQo preflop on level 1. But I am not 100% sure about that.)

In the actual hand I pushed on the flop. But I don't like it at all. (Against a donk I think it's fine though.)
Should I simply fold when the TAG raises on this flop?

Any other way to play the hand except leading on the flop? Checking intending to check/raise?

[Quetzo]

I think even though it's a bigger chance that villain limps with 88 and 44, he might just call with those hands on the flop so AQ and KQ wouldn't be that strange, but it's probably a fold.

I would try to check/raise the flop instead to get som more information from the other players. It's not a huge pot so if all check and a scary turn comes up, I wouldn't have any problem with just folding and missing out on the 180.