There is no big deal.
If this made him burst into tears, he must be a gibbering wreck every single day at school - ne needs to toughen up a bit.
When I was at school kids showed no mercy. Gingers, kids who wore glasses, fat kids, kids who had free school meals etc... basically, any perceived 'weakness' or difference was exploited. Kids who were a bit effeminate were gaylords, bummers and poofters, kids who had any sort of physical impairment were flids, spastics and mongs.
One poor sod went through his whole secondary school life as spastic spencer becuase he had a wonky eye.
This was all in what was considered a good grammar.
I'm pretty sure kids are the same today, so if 'Ginger Kid' (which let's face it is very mild and descriptively accurate) upset him then he's a ginger *** pussy.