I think people need to stop using Comic Sans unironically.
The fact that 'Comic Sans MS' includes the word Comic, does not dictate that it must be used exclusively in humorous or ironic circumstances. Some people enjoy expressing their style through various uses of font and formatting.
When used to excess, any form of expression runs the risk of becoming tedious and trite. But to suggest that people need to stop, implies a rather high level of intolerance. Informing you of this with a more crisp and business-like font such as Courier, for instance, might appear rather harsh and unpleasant. However, the more soothing appearance provided by Comic Sans MS might soften the blow.
There may be others who will say: "You should stop telling people what you think they should and shouldn't do because that makes you look like a petty tyrant, or a just a garden-variety whiner." but I would never say such a thing. I'm more of a to-each-his-own sort of person.
As always (regarding matters of opinion),
I'm not an expert, I'm one of your peers. A forum owner, just like you. Sharing knowledge builds a better community. Proud Member of Guitarnutz2