Nope, not harsh at all.
If you're too stupid to wash after handling dead rodents which may well have feces on them, then you are too stupid to own a snake.
Period.
If you're too stupid to own a snake you will make others who don't own snakes think that I too, as a snake owner, am as stupid as you. I am not. I do not wish to be even suspected as such. Therefore, if you are too stupid to wash after handling dead rodents, please take up guppies or roaches or anything that I don't keep myself.
I'm tired of STUPID people.