Opinion of people who cite Old Testament Mosaic Law verses as "proof" Christians are hypocrites

[Okay, maybe Mike Johnson is a competent parliamentarian.]

Well, there are also many Christians who do constantly cite Old Testament law, and quote Jesus in ways they take as evidence.

Also the ethical problem for why God would supposedly create such ridiculous laws to begin with.

They're only ridiculous when looked at in a modern context. For example: the ban on eating on pork and shellfish is because at the time those were quite unsanitary and a common thread of food-borne illnesses because they couldn't be cooked properly unlike today. Planting more than one type of seed in fields is something that farmers don't do even today, it results in cross pollination and worse harvests in general. Wearing clothing made out of one type of fabric seems trivial today...but that's because we have sewing machines. At the time such clothes were more likely to get tattered and fall apart and were more difficult to wash and since fabric was a much more scarce resource at the time, so keeping clothing usable as long as possible was a much bigger deal than now. And keeping the Sabbath was in some ways the first "labor law", the notion was that everyone deserved at least one day off a week and no one was going to be forced to work all the time. Other examples too.

No, a lot of them really were just ways of enforcing a sacred-profane distinction for its own sake. Read Purity and Danger. Good point regarding the Sabbath, though.

Not that that makes the kind of Whiggish castigation of the Sinaitic covenant that a lot of people do any less stupid or, frankly, dangerous. Literal Nazi theologians loved this framing, given what religion it is that still explicitly and by definition takes the Sinaitic covenant seriously.