Should one stop sending a lunch meal as charity to the Muslim building guard who does not pray?

Prayer is a great (pillar) and the first thing a person will be held accountable for on the Day of Judgment. It is necessary to continue showing kindness to the one who abandons prayer and to treat them with a noble approach. This will make them more receptive to advice, and perhaps Allah will guide them through you, for indeed, that Allah guides a man through you is better for you than red camels. However, if they persist in abandoning prayer after advice and kindness, then it is permissible to cease showing them kindness and to boycott them, if there is hope that such a boycott will lead them to perform prayer.