1-2-3 Live KQo Facing Big 3-Bet Squeeze

Hero (UTG): ~$400
Villain 1 (MP, 40s, black guy with shades, called 3B of $65 in one of the prev hands with 5cX): ~$400
Villain 2 (BTN, young guy, new to table): ~$500

Preflop:
Hero raises to $20 with KcQo
MP1 calls
MP2 (player who previously called $65 3-bets light) calls
BTN (new young guy) 3-bets to $100
Folds back to Hero

Hero?

Thoughts:
He showed AJo, which surprised me a bit. Curious — is this a clear fold, or am I giving too much credit in spots like this? I'm seeing people that show up around 6pm or later start to 3B their PPs like 88+, AJo, and KJs from LP. I'm wondering how I should adjust my play to these kinds of players. I'm not sure I can call such a large 3B OOP cuz it'll make for a tough spot