Why do people give me a hard time about rear facing

I'm wondering if any other moms have this problem. My car seat rear faces up to 40lbs and my 5 year old is in the very small side for height and weight and he is like 33 lbs and not even 40 inches tall yet so we rear face. My friends have 3 year olds bigger than him. He's healthy just on the low end. Anyway I rear face with him in the center seat, based on what's safest for him. I've never been in a rush to turn his carseat and I don't really know why anyone would be if it's the option that is safest. I have had friends family even teachers comment about it. One of my sons school friends made fun of him for it. I don't really get what the big deal is unless I'm living under a rock? His pediatrician is very happy about it and said I'm doing great. I don't really understand why people get to mad about it or get on me about changing it forward. He's in kindergarten and I'm noticing the other kids seem to be in just a booster seat but that's not even really safe according to guidelines especially since some are very small like my son and nobody gives them a hard time so why is it me who is getting all the grief about this ? And it's not something I ever bring up or talk about it's always people bringing it up to me.

What's the deal ? Does anyone else deal with this ?

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