I think giving Rob Liefeld that book is actually a good idea, and it could've been funny if the guy hadn't put it in a bag, thrown it on the table, and ran away.
I think it was also the whole "demanding an apology" that made it unfunny.
If the guy had just walked up to him, handed him the book and said "I think this may be of use to you!" or "I think this might help you!", then yes, that might very well have been funny.
