liberals that constantly shove their opinions, politics, beliefs and ideology down your throat and in your face

Marxism is their religion and like most religions it requires its adherents to proselytize and sing its praises.

Remember that when neomarxists "communicate" they mean something different than normal people. Normal people communicate to exchange information, maybe learn something new, maybe influence the future decisions of the people they are communicating with.

To neomarxists the content of the message is irrelevent, instead they have 3 goals when they "express themselves".

1. signal their personal loyalty to the revolution (virtue signal),
2. sort the targets of the audience into allies and enemies of the revolution based on the reactions
3. attack the enemies of the revolution (satisfy their personal petty sadism through social violence knowing they risk nothing in doing so)