Usually the people who pop out that line mean “keep politics that are different than mine out of”.

Really depends imo. A lot of political discourse naturally falls onto the same tracks towards the same repeated talking points, automatically making the worst assumptions about what people mean, being very defensive and suspicious (or even straight hateful) of anyone not proactively signalling being part of the same group. It's important to face it and deal with it but you may want to take muddy boots off before you come in the house.