The socialist left in Labour believe they are morally right so that entitles them to use insults.
It’s not a winning strategy, too easy for the opposition to to weaponise it, and it turns voters off.
Labour seems to be devoid of political strategy.
With Tony Blair, love him or hate him, he was a centrist with policies designed to attract votes not just from the centre but the slight right/left, he had mass appeal and was successful because of that. I thought Starmer would oversee a return to those policies but it seems he has a full time job fighting the loony left, unfortunately for him it looks like they might just win the battle.