You need to add a triple backslash, because two underscores count as cursive
The first backslash cancels out the first underscore. The second backslash cancels out the first backslash, “re-enabling” the first underscore. The third backslash then cancels the underscore out again.
¯_(ツ)_/¯… : ¯_(ツ)_/¯
¯\_(ツ)_/¯… : ¯*(ツ)*/¯
¯\_(ツ)_/¯ : ¯_(ツ)_/¯
(Dots for alignment. The fourth backslash in the last shrug makes sure no other cursive oddities happen if you use another underscore anywhere else in your post)