Affirming Christians don’t ignore it, but they also don’t need to treat it as a commandment as you seem to. If you read the start of the chapter, it’s talking about practices done by neighbouring communities as they worship their own gods. The instruction here is essentially to the Israelites to make themselves separate from that. It’s relevant to the time and their geography and it is not a code of sexual ethics. Furthermore, even though it’s easy to call it very clear, the verse you cite is not even talking about regular gay sex, and certainly not gay sex in a loving relationship. It’s referring to likely abusive gay sex with teenage boys.
Believing what I’ve just said is not an act of hypocracy, at worst it’s a well meaning misinterpretation. If someone were to pick and choose as you say, and be fine with tattoos (also covered in this section) but use this verse to be against homosexuality then that is hypocracy.