The Prophet ﷺ as saying: Fast is a shield ; when one of you is fasting, he should neither behave in an obscene manner nor foolishly. If a man fights or abuses him, he should say: I am fasting, I am fasting. (Using translation from Abū Dāʾūd 2363)
وَقَالَ رَسُولُ اللهِ ﷺ الصِّيَامُ جُنَّةٌ فَإِذَا كَانَ أَحَدُكُمْ يَوْمًا صَائِمًا فَلَا يَجْهَلْ وَلَا يَرْفُثْ فَإِنِ امْرُؤٌ قَاتَلَهُ أَوْ شَتَمَهُ فَلْيَقُلْ إِنِّي صَائِمٌ إِنِّي صَائِمٌ