> to abuse a gemara (Pesachim, page 112A)
same thing again – find one opinion and claim everyone who disagrees is a rasha
Meiri explains like SQROOT
Ben Ish Hai in addition to what you quote, brings another explanation: that people will hate those chachamim in power who rebuke them and also hate other talmidei chachamim. This is similar to what R Wein writes about anti-religious hate coming from the kehillot in Russia being responsible for forcibly drafting children and ensuring compliance.
As we are here , here is other advice from R Akiva to his son:
Make your Shabbat like a weekday and do not be beholden to other beings;
Join a successful person (in business, I presume)