Nope, I specifically am not.
That speech is not given by Rick. It’s given by Morty. If you’re gonna do the textual analysis thing, that’s a key difference. The show acknowledges Rick is messed up, but Morty is supposedly the normie trying to get by and he uses that particular turn of phrase to comfort Summer, who at that point is coping with the fact her family is dead and replaced by transdimensional dopplegangers. Randomly, as the OP says.
So it’s not Rick’s stance, it’s the stance of the show telling us that, at the very least, letting go of reasons and meaning and purpose and indulging on the commonplace while suspending knowledge that the universe is fundamentally pointless helps in coping. That’s the show talking, not the character.
Alright, that’s way too much Rick and Morty analysis for now. If you get it you get it. I don’t need to convince anyone. Because, you know, nobody exists on purpose, and so on and so forth.
Yes, that precise statement is given by Morty after his whole family was killed and replaced by another one, but if you rewatch the scene it’s very clear that he’s definitely not okay! He’s trying to find comfort in behaving and rationalizing like Rick would, but being miserable while doing so anyways. At no point during that scene, or the whole show for that matter, is the message that it’s the correct approach to coping with anything! If anything, only after the characters suffer cathartic moments and let their emotions run free for a bit is when we see some sort of growth and positivity.