[molawn2mo]

I think the general aversion to a bet/fold line is normal but the way that I, personally, have evolved into losing that cringing thing is the logic that....

1. I value bet. Value betting is one of the stylistic trademarks that I/we/2+2ers tend to exhibit.
2. Value betting in "close" situations must, similarly, warrant that we fold in certain circumstances.
3. Therefore, if we are not folding, correctly, to certain raises then we are not value betting properly (maximally).

Said another way, you could avoid the situation entirely by not betting in any close situation but then you know that you would be leaving money on the table. Therefore, we must adopt lines to include bet calling and bet folding.

Next, in the hand in question, methinks bet/fold is the "default" for the player and the stats you describe (notwithstanding that I am a 10/20 player and have only anecdotal info on the lagginess of the 15/30 game). To look him up is no big crime either but is likely a losing prop.

Lastly, and this is a hijack, versus opponents who understand "value bettors" and who "understand" that bet/fold is a integral part of their game, one must adjust one's standards for folding against this thinking type.