Who gave this guy his CFI initial? What were his motivations in snapchatting a crappy exchange with his student? Was there some rice-bowl issue with this student's usual instructor? The student's father is a pilot and they flew together a fair bit. Did he know about the accident CFI's lack of ability? So many questions for a real investigation to look into.

Since checking and standards are fallible (The accident instructor had his CFI with these deficiencies.) the 1500hr rule is a secondary safety net to catch/correct/educate. I don't think I made that point effectively in my earlier post.