I agree with you that there is such discriminations against muslims.The thinking about sikhs is different and perhaps this is also because different from sikhs,muslims are being linked to terrorism,jehad and other anti-national things.I dont know whether media is responsible for this or not but surely muslims should also try to accept this.The same thing happens in muslim dominated areas also.Why there are frequent riots in cities which are muslim rich like Aligarh,meerut etc.
There is need to actively participate in all activities and be far away from all unnecessary differentiating things.