Green’s Dictionary of Slang

crunchy adj.2

also oatmeal
[crunchy (granola) n.]

(US campus) vegetarian, hippy.

[US]Eble Campus Sl. Apr.
[UK] ‘Doonesbury’ in Guardian G2 10 Nov. 29: Back in the day he was happenin’! Bell bottoms, Donovan records, crunchy politics.
[US]slate.com 28 May 🌐 A North African tyrant in hiding falls for a crunchy Brooklyn peace activist.
[UK]Independent 24 Jan. 36/1: The organic food movement started with all those oatmeal dykes in San Francisco in the early 1970s.