When I was in business, I used to tell my sales team that bad spelling and lazy grammar is telling a customer you don't think them worth the time and effort of addressing them correctly. When I started chairing health authorities, I threw back sloppy reports and refused to have them on board agendas until they resembles English.

Pedant and proud, even if not the best educated in use of English. (Failed language and literature O level and subsequent qualifications have been technical ones.)