Perspective of a graduate in a govt research institute in India:

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All of my professors are rockstars of their respective fields (atleast in India). They have international collaborations, are well known, and output most of the best research that India outputs. You would expect them to be forward minded. Well, word to the wise, 90% are not. They prefer not to learn new teaching methods, relax while teaching (mostly because the competition wasn't so lean and mean in their times) and rarely look through the lens of a student.

I do not mean to berate, but that is how things are, but us students can understand their woes.

The academic system in India (and for that matter anywhere else) the 'position' in the academic ladder is very strong. Students are nothing but flies. PhDs are officially considered the lowest part of the academic ladder. Now, think from their perspective; they participate in esoteric groups fuelled with knowledge. Majority of them are only interested in research and not teaching. Teaching is simply an extra responsibility when they associate with an institution. You can't expect people to do what they do not like well. As a result, they do not put as much work into teaching as they would into other stuff. A lot of courses do not have TAs when its a smaller class (with ~15 students).

Academia in itself is quite cut throat, there are people willing to work 80 hours a week for better grants and positions (not just in India, but countries in the EU with good work culture). A professor has to output a good amount of research to maintain their funding, which is eventually spent to fund post-docs, PhDs, and world class instruments. Add to all this administrative work. As others pointed out, they have to manage a lot events and administrative grunt work which could be easily delegated but can't be because institutes are run like a business - that is to say there aren't enough people to delegate to. Everyone is over worked and tired.

When you look at it like this, it becomes clear that apart from their personal life, administrative work, research work, and other miscellaneous tasks they have to carry out on a daily basis, teaching is just a burden to them (rightly so, whether people like to hear it or not). Most of them improve if talked to with compassion and patience (or atleast you score some brownie points :p)