Sorry for your loss! It's one of the hardest things, not only with losing your dad, but having to submerge yourself in the JW environment again. When my dad died I too had to go back to the kingdom hall etc, it's such a mixture of feelings. Emotions are heightened so it's easy to become sensitive about things which may not have troubled you much before. It definitely gets better! I fell out with my close JW sister and her husband around that time but things are pretty amicable now.
I've now learned to accept the quirks of the JWs, it doesn't bother me anymore (it's actually amusing sometimes). Doesn't matter if the same courtesy isn't reciprocated, I understand the situation and that gives me peace. Have learned to build my self worth in other ways (not validation through acknowledgment of other people or feeling accepted within a certain class). It's good to know why there's been such a big learning curve when leaving (e.g. social awkwardness, detachment, difficulty trusting people etc). In a sense, since I know how much adapting that's had to be done, it makes me realise many of my former associates are still "in that (deluded) place" so don't hold much against them (pity more than anything else). You do get the few narcissistic types, or power hungry ones, but in the main I find they're just trying to clutch onto some sort of hope (even though IMO the doctrines are often the main cause of fear etc).
Going cold turkey (no JW contact at all, either through people or media/online forums) is usually a great plan - focus on your own life (building lasting friendships etc) and don't expect much, if anything at all, from your former JW friends. That's not to sound negative or bashful towards all JWs, just a bit of realism, especially if you're feeling extra delicate :)