Would people laugh at you if you are sunburnt?

Depends on the person and where/how someone is sunburned.

Sometimes sunburns look strange or silly on you so others will laugh at you. Other times they are merely laughing at the fact you were irresponsible with your skin.

However, decent people won't laugh but sympathize and are generally polite enough not to stare at you. After all, it's not very nice to laugh at someone when they are clearly uncomfortable or in pain.