Whether something is humor can be objectively established by disassembly of the structure of the content, whereas 'if you find it funny' is personal, yet 'if it is funny' is a summary of whether a certain group (such as 'the general public', whatever that may be) find it as such.
As such, I believe the expression of not finding someone or something funny a red herring. Different emotions obviously flourish, and the person who expresses that they don't find it funny finds these (more) important.
The red herring here isn't whether The Onion is funny or not (personal), it isn't whether it is humor or not (it is, specifically satire). It is that you fundamentally disagree with the political message it entails. Which you are allowed to do so, but in a discussion it is useful to recognize a significant amount of people do find it funny, and either have no problem with the political messages (tolerance) or agree with these (acceptance).
In any case, I've never laughed as hard at anything Lenny fucking Bruce said as I did at The Onions "Sony Releases Stupid Piece Of Shit That Doesn't Fucking Work" bit. So if you've got some favorite bruce bits, I'd love to get educated on what is hilarious about 60 year old observational standup.