I only filter to the front if the road is wide enough or has bike lane or the traffic is slow enough for me to pace. Else, I don't. That is for my OWN SAFETY.
On the other hand, I don't mind other riders indiscriminately filtering to the front. Really don't care.
I still drive a car occasionally when buying too many groceries for the bike to carry. The car is used mostly to haul stuff now. But any purchases under 50 lbs, I use the bike.