I disagree. Theresa May tried US-style personality electioneering and ended up with a minority government (and this was when the Conservative government was perceived to have been strong [or she would not have called an election]).
Truth is the hoi polloi vastly outnumber the rose-pruning Home Counties brigade, who whilst they own the hegemony (BBC, broadsheets, tabloids) and exert a powerful influence, there are many sectors of the unwashed masses who will NEVER vote Conservative, just as there are those diehard working class Tories who worship Thatcher because she helped them make a killing on buying their council homes at great discount.
Sociologists have identified that in general the Irish element vote Labour, as does it seems the Scots in the UK.
Now I tend to be left leaning but if it is going to be based on personality I have to say there are several Labour MPs I cannot stand. I like Corbyn, Abbott, Lammy, Sheerman, Yvette Cooper (who'd make a great party leader IMV). However, most do not float my boat. For example, Tulip Siddiq, Thornberry, Kate Hoey, Holly Lynch, the northerner 'working mum' who flaps her arms around and everyone thinks should be next leader (Nooooooo!).
This does make me wonder whether this is my Home Counties bourgeois [snobby] background shining through and perhaps I should vote in accordance with where my economic interests lie (for example, decrease inheritance tax, income tax and company tax). But can I stand that MP who keeps wittering on about the Ribble Valley? (Heavens, no!)
No, it is best to vote on policy and what is best for the country and not on personalities. Therein lies the road to Hell.