Ds will be 5 and the party bags will have mainly 'boy' type toys and some sweets.
I wouldn't usually give it a second thought but at the last party we went to two of the girls refused to see down and eat because the plates were pirate plates and so were for boys 
One girl even cried.
And instead of telling them to get a grip the parents were all 'there there, no there aren't any princess plates. Just put your food on your service the.'
So Aibu to put dinosaurs, bugs and cars in the girls party bags too? I reckon there will be some girls who would prefer this anyway so better to give all the same!