Why don't overweight guys like overweight women?

I'm not trying to offend anyone but if did I'm sorry. Out of curiosity why does it seem like most overweight guys I've ran into mock and insult overweight women and refuse to date one even though they're overweight themselves and only go for the slim or petite girls. Then they complain or refuse to take no as an answer when a slim girl doesn't want to date them. I just find it hypocritical and sometimes I wonder is this because they are insecure or do they have their own issues or does it just stem from something else? It seems like this bashing happens online and I remember a couple of overweight guys I went to high school with would do that.
Why don't overweight guys like overweight women?
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