Tristan Thompson avoided major backlash from fans for cheating on Khloe Kardashian by checking into tonight's Cavs game under the radar ... but he got a fair share of boos later.
The power forward checked in off the bench near the end of the 1st quarter during a timeout ... so he was able to take the court without the PA announcer saying his name. Good start for Tristan.
However, our sources at the game say boos rained down later when he was shown on screen, and more came when he got called for a couple personal fouls.