I've been reading the comments lately for my own amusement, except the last critic above who didn't even read the manga or he did and is just trolling and should be ignored completely.
But people, you're all going too far, and I said this as one of those who called Mei a robot last year, but back then we all reached a silent agreement that their pace and love was just not meant for us anymore but to the remaining fans who are actually enjoying this, and that we, the antifans were reading this only to see if Harumin and Matsuri get together too, I'm sure you all can find a better use of your time than being angry at Mei or the author or at least not bother those who are just trying to have a good time, remember that Chaos Team once considered not to post in dynasty anymore.
Yes I agree that Mei's development is using the "2 steps back and 1 step forward" formula to give us an illusion of progress, but Yuzu loves her enough to wait whatever time necessary for both of them to be ready, could be months or years, is up to them, there isn't a time limit (But we also know it will paid off eventually).
And like the other person said, this is a Kuudere case, or in Mei's case someone who's heart was damaged and then healed like new by Yuzu, but now she needs to learn everything from zero the proper way (still it IS the 2 steps back and 1 forward way). They don't dislike each others and they don't try to hurt each others.
If you want to redirect your hatred of frustration it should be to Maid Dragon for example, it fits more to what some of you are describing, that's a real case of someone giving 200% love while the other will once a month give 5%, a headpat if anything, because most of the times Kobayashi is angry at Tohru for trying to get a hug, for having big breast or trying to go on a date, she rather stays home sleeping or watching tv that going on a date with the person that loves her and that she supposedly loves back.
Similar case with Yui and Kyoko from Yuru yuri ( Kyoko x Ayano is the best btw), 90 % of the times that Kyoko tries to get attention she's countered with a "ugghhh such a pain!" or Get off me!. Yui and Kobayashi can be seen clearly disgusted and angry when they receive affection, but I never get that from Mai, she just doesn't know how to respond, she gets afraid and decides not to act at all and Yuzu knows this, that's why she waits.
So yeah, TLDR just skips the chapters with Yuzu and Mei if you don't like them, I think we've been proved time and time again that their relationship is what it is and you would be a fool for expecting huge changes.