Cringe would be wearing them with a suit or as shoes to stand in for work. Using them for a running race? That's the point. Is this some sort of poverty mindset at play?
Wearing alphaflys to a local parkrun is perfectly normal.
To answer the question you didn't ask: using cringe as an adjective, or however you misused it and many others misuse it, makes the user look like a complete dolt.
Languages evolve over time; they do not have permanently-fixed words or grammar. Cringe is now used as an adjective in modern society, and dictionaries such as Merriam-Webster include the adjective (as slang) in its list of definitions for the word. So unless you are seeking to eliminate the use of all slang from message boards (a task that is both quixotic and doltish), then stick to running comments.
Cringe as an adjective is a bit 2019.
It came about as a result of non-native English speakers not understanding the difference between adjectives and nouns.