Can't speak of Mods......... I was a 'Rocker/Greaser', but the violence at Margate, etc., was Media inspired. In the Sutton and surrounding areas, very little friction occurred between the two groups as they kept to their own areas, (normally). However the post '70 emergence of the Townie/suedehead/skinhead culture that took over the Mod scooter groups was, in essence Violence based, with a lot of it being Gang/Football yob related.
The Mod lifestyle was based upon Clothes and the (then) newly found Teenager power base. Mods went for clean, well paid office type jobs, Rockers were, in general, poorer and more drawn from the Engineering/labouring side of life. Mods spent cash on clothes, records, dances, sometimes Scooters for mobility, whereas Rockers were virtually dedicated to Motorcycles. Both groups smoked, Mods took pills and drank alcohol, but Rockers abhorred Drugs and, suprisingly, few drank alcohol, It was mostly Coffee or Tea, (or Coke if you'd been paid !).
Most Dances, etc., saw fights break out, this is no different to today, (over 30 years of Emergency Service work has taught me that !). However the sort of 'turf wars' that happen in Aston & Lozells today could never have been imagined back in the 60s & 70s.
Hope this helps ?