If I have a gun but the government doesn’t care, am I not exercising my 2a rights?
No, you are not.
You have a right to not be unduly burdened by the government in owning or procuring a gun.
It does not follow that because the government is not allowed to arbitrarily restrict your ability to own a gun, you therefor have a “right to own a gun”. For example, if you do not own a gun, and everyone who does own a gun doesn’t want to give/sell you a gun, your 2a rights were not violated.
……
Putting up a lost cat flyer, and having some random person yell at you for it is not exercising the “right to free speech” (for either party).
You have a right to not be unduly burdened by the government in speech/expression.
It does not follow that because the government is not allowed to arbitrarily restrict your speech/expression, you therefor have a right to speech/expression in all contexts. For example, if you want to go on a rant about your personal beliefs, the government unduly burdened you. However this will not stop the owner of the grocery store from calling the cops to have you trespassed for bothering all of the customers.
Maybe giving equal training weight to r/sovereigncitizen and r/asklegal wasn’t the best idea.