This is kind of ignorant of the fact that the defensive state is a reaction to harmful behavior. You're placing the burden of 'dealing with it' on the passive participant, when it belongs to the active party. If you can't stand the 'harm' of a negative reaction to picking a girl up on LinkedIn, then don't do it. They, unfortunately, don't get the option to avoid it before it happens.

Secondly, as a LinkedIn user, there is a reasonable expectation that communication in the platform will be professional. The platform's value proposition is grounded in this expectation as a sort of social contract. Sometimes people are ok with others defying said social contract, but you should assume they won't be.