What's the worst part about Asians giving blowjobs? When they bite your dick off because it tasted like dog
This is a very offensive joke to Asians.
I'm not saying it to you, so why should you be offended?
It does not matter if I am offended, I know that this joke is too cruel to make. It has too much of a negative stereotype to it and claims things that are not true at all.
Would it be racist if I was South Asian?
Your ethnicity does not give you a pass to make racist jokes. What you said was racist.