This might not be like you, but how about at least observing basic manners.
Literal
You-like-not maybe [but-が], at-least etiquette [about-くらい] observed-[conditional-たら] how [copula-だ].
~らしくない 'not like (someone), out of character for.' せめて 'at the very least' sets a minimum expectation. ~たらどうだ 'how about doing, why don't you' is a suggestion with a slightly irritated edge — sterner than ~たらどうですか. 礼儀くらい 'at least manners' — くらい minimizes the request.