How do blue and white collar workers decide how many electoral votes each state gets?

Blue and white collar workers have nothing to do with the decision of electoral votes. Electoral votes are apportioned according to state populations, as are seats in the House of Representatives. This is the main reason why the government undertakes the census-- an impartial accounting of population distribution.

Blue collar vs white collar workers merely refers to the difference in dress between working-class (laborers) and upper class (office) workers. Electoral votes are apportioned according to population numbers, not income of the voters.