This is a known bug on KitKat. The legacy WebView renderer crashes on some comment threads. The better alternative is to use YouTube 14.21.54 , which uses an older comment rendering system that is more stable.
Downloading the official YouTube app for Android 4.4.2 (KitKat) is no longer possible through the Google Play Store because Google dropped support for this OS version in 2023. While you can download old YouTube APKs from third-party sites, many official versions no longer function correctly on KitKat. youtube apk better download android 44 2
Look for YouTube Go version 2.01.3 . This is the final stable release that supports Android 4.4.2. Never install version 3.0 or higher. This is a known bug on KitKat