Why do altcoins always seem to do this?

Noticed many times when bitcoin is at a value say 118250 then it loses 0.75% value to 117250 say, alts will immediately lose like 4-6% every time. Why is it so dramatic?

I didnt create a meme so will just write out a meme in interpretive text to make my point: The scene shows a messy work area, a map, a calendar and other paraphernalia is seen in the background. the camera angle is positioned so it is tilted slightly upwards and shows ‘Joe Exotic’ from Tiger King looming in the shot with a look of distress and deflation. On the top section of the meme the text reads ‘BTC loses 0.75% value’. The character of Joe Exotic has a poorly edited label ‘Altcoin’ overlaid his face. The bottom text reads ‘I can never financially recover from this, I must immediately lose 5% of my value’.