They're not being made fun of for being white cishet men. They're being made fun of for being privileged and whinging about other people now receiving the rights to which they felt they alone were entitled. Being privileged is not something you are born with, it is something granted to you by an unjust society. Crying about others being granted rights as if it will affect them negatively is a choice they are making. This is not about them being cishet white dudes. It is about them choosing to resist progress because it might mean they don't get treated like the super special kiddies our society has always treated them as.
That you are equating "haha these privileged people are overreacting to minorities no longer having boots on their necks" with "boo hoo, you're saying all white cishet dudes are bad" tells me all I need to know. I won't be able to change your mind, so have fun feeling persecuted 💜