Now, I do NOT think it's fair to make mean remarks about people's strollers. Those parents are only on the bus for a fraction of the day whereas them and the child(ren) are using the stroller all day so I would expect a parent to choose a stroller based on daily use not how other people want to view their stroller on the bus.
People, get over it with the stupid stroller crap. People have strollers. Frankly, I'd rather see a big comfy stroller folded on a bus than a miserable, hot, tired 1yr old stuffed in a $10 umbrella cause no one cared about their comfort. Don't like sitting next to it? get out of your seat and STAND. Just as you can point fingers at rudeness of people expecting big space at parades, its the same for people saying stroller users shouldn't use the bus.
Also, as the parent of a 6, 5, and 2yr old, I woudn't expect anyone to give up a seat for my 6yr old. ____'s fully capable of standing and riding and would enjoy it. My 5yr old, though, is disabled but is able to walk. On quick glance, other than leg braces, he looks like a typical 5yr old, but he would NOT being able to ride standing. I would pick him up and hold him for the ride, but he has a WC so that won't happen. lol.