Refs and linesmen should also be held to account for their behaviour, whether that is the decisions they make on the field, through VAR or general behaviour/interactions with players. Everything will come in the wash, but the linesman over-reacted and will obviously have to face the consequences, as players have done, such as Mitrovic, Silva, etc. Just because it was against LIverpool doesn't mean they get a free pass or it's excusable.
PGMOL suspends linesman for 5 weeks and FA should suspend Robertson, who seems to have gotten away with a confrontation against an official. It must have been some dramatic incident that no one knows what it was all about. Respect armbands my ass.