It's humor. The 'tehehe' should have been your first clue that it was humor. It's not like I am comparing Tom's family photo with a photo of Hitler which I'm sure would offend millions of Jewish people.
Strangely I thought Hitler typically offended alot of people, not just the Jewish people.I guess that means you don't find Hitler offensive?
Is a personal attack... Hitler offends everybody in some way...but is gold for comedic comment as u cant go any higher/harder/more offensive than him...
There are a couple of schools of thought that the universe is infinite or finite..In the finite viewpoint that i adhere too, you will find once u reach the end of the universe..Hitler will be there... (IMHO)