Except I would disagree with your decription of it as nonsense. If you look at a lot of the laws that we now regard as nonsensical, they had good reasons for them. Cooking pork is difficult at the best of times, let alone in the desert. Similarly with shellfish. The practice of mixing fibres or using old wineskins for a new brew are both commonsense when natural materials are concerned.
And that's not nonsense, that's learning from previous errors or foreseeable problems.
'Don't do this because the sky-man will be angry' is nonsense. It might have been the best explanation they had available, but with hindsight it's nonsense.
To criticise it as nonsense is not to single out Jews (cultural, ethnic or religious), especially given that the implication was about Christians who selectively cite some of these objections (the ones without any perceivable benefit, typically) whilst ignoring the others. That's, perhaps, anti-theist, but it's not anti-semitic.
O.
