He bet ~3x PSB OTR. Your pot odds are 3/(3+1+3) = 3/7 ~= 43%

You can call with anything that beats at least 43% of his range.
I don't think QT is in that category on this board, but it could be.
If so, it'd drive me mad. I don't handle the variance well, and when a villain forces me to play a high variance game, it stresses me out more quickly than other villains. For me, this means my best move is probably to switch tables. Sure, I can spend the time and effort learning to have the better edge in practical coin flips against ultra-LAG players... or I can just focus on the things that I'm currently studying and not get side-tracked.

It's not that I don't want to learn to beat that villain. It's that they don't represent the top of the bell curve of players I face. If I study the most common situations, then I can increase my edge against the most common situations first. Later, I can work on dealing with wide ranges, but for now, I just want to focus on learning the "cores" of ranges. Later, those cores will be the foundation from which the LAG ranges are built.