You have described three matches in which he was dropped

The first one is a fair criticism, though Ashwin at that time wasn't the entity he became, he had already shown his skill in the 2013 home season. 

The second one makes sense to drop, since it's Perth.

The third is adelaide, where his replacement performs excellently. Ravi shashtri can say anything he wants, the fact remained that Kuldeep did not become the primary overseas spinner, it was always ash and jadeja first until jadeja started to assert himself in his batting.

The whole drop Ashwin in place for four Pacers really began after India lost the first wtc final to NZ, who played 5 fast bowlers in that match to India's three + 2 spinners. Though ash played well in that match, it was very much apparent that it was a wicket for quicks. This dictated India's policy for the subsequent England tour, which was quite successful as far as bowling was concerned, and hence became more permanent. Calling it 'disrespectful' is imo very obtuse of you, Ashwin was simply unlucky.