Comments like these are generally regs trying to impress each other and definitely make the losing player feel even smaller as the chips travel away from their seat. I've done this myself, but it was at a table 100% full of regs where the comments are 'typical'.
Typically I will interject that "I though he was bluffing" to hopefully keep the losing player at the table if they got felted. Went through a tough hand like this over the weekend.
Board 3
4
5
T
8
4 players to the River and it goes check, check, check, bet 1/4 pot ... fold , fold to me. I'm holding 67
and couldn't get anyone to fold on the Turn.
As soon as I called the River bet after some tanking .. "Of course he has a flush!!" comes out of a player. Well, I really didn't want to get into the needing to be right only 20% of the time conversation with him. GL