That's really a sad story. Most time people say that Madhabs are not sects, They are School of Thoughts and it's because there is different opinions of Islamic Scholars. Well if that's so than why people call themselves as Hanafi, Shafi', Malaki, Hanbali? Why don't they call themselves as Muslims? They also say 'That all Madhabs are right' So why do people have problem if a person does not follow your Madhab?
Actually people forgot the message of the Qur'an and Sunnah.
The Glorious Qur’an says:
“And hold fast, altogether, by the rope Which Allah (stretches out for you), and be not divided among yourselves.' [Al-Qur'an 3:103]
Which is the rope of Allah that is being referred to in this verse? It is the Glorious Qur'an. The Glorious Qur’an is the rope of Allah which all Muslims should hold fast together. There is double emphasis in this verse. Beside saying ‘hold fast all together’ it also says, ‘be not divided’.
The Qur’an further says,
“Obey Allah, and obey the Messenger” [Al-Qur’an 4:59]