I feel very bad for this dude. I can relate with every single line. There's no solution for the present majoritarian crisis in India unless there is a forced regime change. Even then the divisions and scars will stay permanent at least for a generation or two.
The Muslims of India should embrace their Islamic identity with greater fervour, and stay away from the Sanghi crowd as much as possible. Don't make colleagues out of them, don't watch their television shows or movies, don't hang out with them for chai adda. Of course, Islam teaches you to be broad-minded so if any non-Sanghi Hindus/Sikhs/Jains etc. want to hang out with you, embrace them in your fold. If he/she is allergic to the sound of azaan or says crap things derived from WhatsApp University, tell them to immediately get up and leave. Such persons obviously can't be your friends.
No Muslims should have to feel conspicuous of saying salam walekum or a child calling his father, "abba", or hestitating to eat non-veg food? No Muslims should compromise on their basic identity and cultural habits. To hell with anyone who says nasty stuff, don't pay attention to the street dogs if you're in their turf, and confrontation is not advisable. For any problems such as discrimination, immediately escalate it to the level of Amnesty International or consult lawyers.
All Muslims working in Hindu corporations should bandy together and engage with professional lawyer organizations, and file for discrimination if they were unfairly treated. The banya only understands the bottomline, once he finds out that the Muslim will not take any abuse in the workplace sitting down, then he will immediately workplace policies to prevent harassment based on religion.
Always engage with local Congress/CPI-M outfits. They are always looking for an excuse to malign the BJP, and they will scream on your behalf.
Basically always escalate the matter when you have a good chance of getting your own back.
Also carry a video camera at all times, and film the nasty interactions to be later put on YouTube. Make sure the phones are cheap because they might try to destroy your equipment.
I support Rana Ayyub and others like her who are fighting these pigs on a daily basis. But for most interactions in life, fights should be avoided.
There is strength in unity.