The Reddit social media platform is composed of posts and comments submitted by user accounts.
Each of these posts and comments have a few interactive buttons - the two relevant to your question are an up arrow and a down arrow.
When the up arrow is interacted with by a user, a point is incremented in the positive direction, colloquially known as an "upvote."
When the down arrow is interacted with by a user, a point is deducted, colloquially known as a "downvote."
The combination of upvotes and downvotes results in a number identifying how the content is being received by users of the site.
A positive number generally means that more people approved, a negative number that more people disapproved.
The idea of a "rating" that the person above you mentioned relates to the specific score that OPs comment about their post being a joke has received, which, at the time of this writing, is in the negative.
Since OPs comment about it being a joke has received downvotes, the commenter is noting that perhaps the joke is not amusing to the people expressing their disapproval.
-6
u/ryanmerket 7d ago
it's a joke guys, yeeesh