Mark Wahlberg -- Applauds Tom Brady's Obama Snub ... And a Hundo for the Homeless Guy!

Mark Wahlberg always has time to help a brother out -- whether it's Tom Brady, or the homeless guy who gets caught in a swarm of photogs -- and his generosity was on full display in Bev Hills.

After Mark and his entourage had lunch at E. Baldi on Thursday ... he was making his way to his ride when he handed a C-note to a guy in a wheelchair without missing a beat or making a big deal about it.

It's as smooth and solid a move as we've ever seen a celeb make.

Bonus: Mark sounds off about the QB of his beloved Patriots skipping the team's White House trip. His take -- heartwarming ... and a little cocky.

Wicked awesome.