Questions on the Explanation of the Book of Nullifiers of Islam

The questioner:
Does buying from disbelievers count as showing loyalty to them, given that it is said this strengthens the disbelievers economically, and that this is aiding them against the Muslims?

The Shaykh:
This is the talk of an ignorant person. This is the talk of an ignorant person. The Messenger (peace and blessings be upon him) bought from disbelievers; he bought from the Jews and dealt with them, and Muslims deal with disbelievers. This is in the interest of the Muslims. The interest in this lies with the Muslims. Yes. It is not strengthening the disbelievers. Yes.

The presenter:
May Allah reward you, Honorable Shaykh.

The Shaykh:
You buy cars but you do not buy machines and equipment, you do not buy clothes. The whole world manufactures things with them now, yet you do not buy anything from them. Go around without clothing and go around without riding, and say this is boycotting the disbelievers. This is not permissible. This talk is harmful to the Muslims; the disbelievers rejoice over this.